To catch a thief

Back in the 1950s, when the neutrino was still a hypothesis but iron curtain was a reality, A. Szalay in Hungary had an idea to take a snapshot of an event that would prove the existence of the neutrino. During his research at Cavendish Laboratory (United Kingdom), he became acquainted with the latest techniques for research in nuclear physics, and decided to investigate the decay of ⁶He, a short lived isotope. He recruited J. Csikai, then a young scientist, and together they built a cloud chamber with a sophisticated stereo-camera system.
Forget about megapixels, data acquisition system, everything was hardwired. Still, from the tracks…